# Lux Meter – Light Meter — Illuminance, EV & foot-candle

> Illuminance, EV & foot-candle (iPhone/iPad app by Alper Sumer Guc.)

- Source: https://appshunter.io/ios/app/lux-meter-light-meter/id6790800796 (this page in markdown: same URL + `.md`)
- Developer: [Alper Sumer Guc](https://appshunter.io/developer/1896672915)
- Category: Utilities, Photo & Video
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: American English, French (France), German (Germany), Japanese, Korean, Brazilian Portuguese, Chinese (Simplified, China), European Spanish
- Released: 2026-07-22
- Data updated: 2026-08-26
- User reviews in markdown: https://appshunter.io/ios/app/lux-meter-light-meter/id6790800796/reviews.md

## What is Lux Meter?

Lux Meter turns your iPhone into a professional light meter. Using your camera and the ISO 2720 photographic standard, it measures illuminance in lux and foot-candles in real time — accurately, fully offline, with no ads and no sign-up.

Whether you're setting up studio lighting, checking your desk for eye comfort, dialing in grow lights for plants, or metering a film scene, Lux Meter gives you the numbers the pros rely on.

MEASURE
• Real-time lux and foot-candle readout (tap to switch units)
• Exposure Value (EV) at your chosen ISO
• Color temperature (CCT in Kelvin) estimate from the camera
• Live camera preview with a center spot reticle
• Spot metering (center) or average metering (whole frame)
• Min / max / average statistics with a live chart
• Hold to lock a reading
• Plain-language light labels (Office lighting, Overcast day, Direct sunlight…)
• Low-light path reads down to sub-1 lux

EXPOSURE CALCULATOR (2-in-1)
• Set any two of aperture / shutter / ISO — it solves the third
• Cinema mode: frame-rate and shutter-angle presets, plus the 180° rule
• ND filter and exposure compensation
• Sunny 16 helper and a depth-of-field estimate

TARGETS & PRESETS
• Use-case presets: Reading, Office/Ergonomics, Photography, Film/Video, Plants & Greenhouse, Aquarium/Terrarium
• Set a target lux band and get a subtle alert when the light is in range
• Optional haptic and audio meter tick that speeds up as light increases

CALIBRATION YOU CAN TRUST
• Independent calibration for front and back cameras
• Multi-point calibration fitted across the whole range
• See raw and calibrated values side by side
• Reset to default anytime

SAVE & EXPORT
• Save single readings or record a session over time
• Min/max/average per session, notes and optional location tag
• History list with rename, delete and CSV export (share sheet)

BUILT RIGHT
• Works 100% offline — no account, no tracking, no network
• No ads, nothing locked behind a paywall
• Grid and histogram overlays, screen-brightness pin, keep-awake
• Clean dark-first design, light mode too
• 8 languages with instant in-app switching

A note on accuracy: iOS does not give apps access to the ambient light sensor, so Lux Meter uses camera-based reflective metering (ISO 2720). For best results, calibrate once against a reference and use the same lighting conditions.

Measure light like a pro. Download Lux Meter.


## Version history (last 2 releases)

### 1.1 — 2026-08-19

New: Grow Light meter — turn any reading into PPFD and the Daily Light Integral (DLI) for your plants, with light-source presets and plant-care guidance.
Also: histogram overlay on by default, a clearer lux/foot-candle switch, and refinements.

### 1.0 — 2026-07-22

No release notes.

## More apps by Alper Sumer Guc

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- [Latitude and Longitude Finder](https://appshunter.io/ios/app/latitude-and-longitude-finder/id6771930378)

All apps by Alper Sumer Guc: https://appshunter.io/developer/1896672915

## Related topics

[luminosys](https://appshunter.io/ios/topics/luminosys)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-26.*